1 // SPDX-License-Identifier: LGPL-2.1
2 /*
3 * Copyright (c) 2012 Taobao.
4 * Written by Tao Ma <boyu.mt@taobao.com>
5 */
6
7 #include <linux/iomap.h>
8 #include <linux/fiemap.h>
9 #include <linux/namei.h>
10 #include <linux/iversion.h>
11 #include <linux/sched/mm.h>
12
13 #include "ext4_jbd2.h"
14 #include "ext4.h"
15 #include "xattr.h"
16 #include "truncate.h"
17
18 #define EXT4_XATTR_SYSTEM_DATA "data"
19 #define EXT4_MIN_INLINE_DATA_SIZE ((sizeof(__le32) * EXT4_N_BLOCKS))
20 #define EXT4_INLINE_DOTDOT_OFFSET 2
21 #define EXT4_INLINE_DOTDOT_SIZE 4
22
23
24 static int ext4_da_convert_inline_data_to_extent(struct address_space *mapping,
25 struct inode *inode,
26 void **fsdata);
27
ext4_get_inline_size(struct inode * inode)28 static int ext4_get_inline_size(struct inode *inode)
29 {
30 if (EXT4_I(inode)->i_inline_off)
31 return EXT4_I(inode)->i_inline_size;
32
33 return 0;
34 }
35
get_max_inline_xattr_value_size(struct inode * inode,struct ext4_iloc * iloc)36 static int get_max_inline_xattr_value_size(struct inode *inode,
37 struct ext4_iloc *iloc)
38 {
39 struct ext4_xattr_ibody_header *header;
40 struct ext4_xattr_entry *entry;
41 struct ext4_inode *raw_inode;
42 void *end;
43 int free, min_offs;
44
45 if (!EXT4_INODE_HAS_XATTR_SPACE(inode))
46 return 0;
47
48 min_offs = EXT4_SB(inode->i_sb)->s_inode_size -
49 EXT4_GOOD_OLD_INODE_SIZE -
50 EXT4_I(inode)->i_extra_isize -
51 sizeof(struct ext4_xattr_ibody_header);
52
53 /*
54 * We need to subtract another sizeof(__u32) since an in-inode xattr
55 * needs an empty 4 bytes to indicate the gap between the xattr entry
56 * and the name/value pair.
57 */
58 if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR))
59 return EXT4_XATTR_SIZE(min_offs -
60 EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA)) -
61 EXT4_XATTR_ROUND - sizeof(__u32));
62
63 raw_inode = ext4_raw_inode(iloc);
64 header = IHDR(inode, raw_inode);
65 entry = IFIRST(header);
66 end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size;
67
68 /* Compute min_offs. */
69 while (!IS_LAST_ENTRY(entry)) {
70 void *next = EXT4_XATTR_NEXT(entry);
71
72 if (next >= end) {
73 EXT4_ERROR_INODE(inode,
74 "corrupt xattr in inline inode");
75 return 0;
76 }
77 if (!entry->e_value_inum && entry->e_value_size) {
78 size_t offs = le16_to_cpu(entry->e_value_offs);
79 if (offs < min_offs)
80 min_offs = offs;
81 }
82 entry = next;
83 }
84 free = min_offs -
85 ((void *)entry - (void *)IFIRST(header)) - sizeof(__u32);
86
87 if (EXT4_I(inode)->i_inline_off) {
88 entry = (struct ext4_xattr_entry *)
89 ((void *)raw_inode + EXT4_I(inode)->i_inline_off);
90
91 free += EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size));
92 goto out;
93 }
94
95 free -= EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA));
96
97 if (free > EXT4_XATTR_ROUND)
98 free = EXT4_XATTR_SIZE(free - EXT4_XATTR_ROUND);
99 else
100 free = 0;
101
102 out:
103 return free;
104 }
105
106 /*
107 * Get the maximum size we now can store in an inode.
108 * If we can't find the space for a xattr entry, don't use the space
109 * of the extents since we have no space to indicate the inline data.
110 */
ext4_get_max_inline_size(struct inode * inode)111 int ext4_get_max_inline_size(struct inode *inode)
112 {
113 int error, max_inline_size;
114 struct ext4_iloc iloc;
115
116 if (EXT4_I(inode)->i_extra_isize == 0)
117 return 0;
118
119 error = ext4_get_inode_loc(inode, &iloc);
120 if (error) {
121 ext4_error_inode_err(inode, __func__, __LINE__, 0, -error,
122 "can't get inode location %lu",
123 inode->i_ino);
124 return 0;
125 }
126
127 down_read(&EXT4_I(inode)->xattr_sem);
128 max_inline_size = get_max_inline_xattr_value_size(inode, &iloc);
129 up_read(&EXT4_I(inode)->xattr_sem);
130
131 brelse(iloc.bh);
132
133 if (!max_inline_size)
134 return 0;
135
136 return max_inline_size + EXT4_MIN_INLINE_DATA_SIZE;
137 }
138
139 /*
140 * this function does not take xattr_sem, which is OK because it is
141 * currently only used in a code path coming form ext4_iget, before
142 * the new inode has been unlocked
143 */
ext4_find_inline_data_nolock(struct inode * inode)144 int ext4_find_inline_data_nolock(struct inode *inode)
145 {
146 struct ext4_xattr_ibody_find is = {
147 .s = { .not_found = -ENODATA, },
148 };
149 struct ext4_xattr_info i = {
150 .name_index = EXT4_XATTR_INDEX_SYSTEM,
151 .name = EXT4_XATTR_SYSTEM_DATA,
152 };
153 int error;
154
155 if (EXT4_I(inode)->i_extra_isize == 0)
156 return 0;
157
158 error = ext4_get_inode_loc(inode, &is.iloc);
159 if (error)
160 return error;
161
162 error = ext4_xattr_ibody_find(inode, &i, &is);
163 if (error)
164 goto out;
165
166 if (!is.s.not_found) {
167 if (is.s.here->e_value_inum) {
168 EXT4_ERROR_INODE(inode, "inline data xattr refers "
169 "to an external xattr inode");
170 error = -EFSCORRUPTED;
171 goto out;
172 }
173 EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
174 (void *)ext4_raw_inode(&is.iloc));
175 EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
176 le32_to_cpu(is.s.here->e_value_size);
177 }
178 out:
179 brelse(is.iloc.bh);
180 return error;
181 }
182
ext4_read_inline_data(struct inode * inode,void * buffer,unsigned int len,struct ext4_iloc * iloc)183 static int ext4_read_inline_data(struct inode *inode, void *buffer,
184 unsigned int len,
185 struct ext4_iloc *iloc)
186 {
187 struct ext4_xattr_entry *entry;
188 struct ext4_xattr_ibody_header *header;
189 int cp_len = 0;
190 struct ext4_inode *raw_inode;
191
192 if (!len)
193 return 0;
194
195 BUG_ON(len > EXT4_I(inode)->i_inline_size);
196
197 cp_len = min_t(unsigned int, len, EXT4_MIN_INLINE_DATA_SIZE);
198
199 raw_inode = ext4_raw_inode(iloc);
200 memcpy(buffer, (void *)(raw_inode->i_block), cp_len);
201
202 len -= cp_len;
203 buffer += cp_len;
204
205 if (!len)
206 goto out;
207
208 header = IHDR(inode, raw_inode);
209 entry = (struct ext4_xattr_entry *)((void *)raw_inode +
210 EXT4_I(inode)->i_inline_off);
211 len = min_t(unsigned int, len,
212 (unsigned int)le32_to_cpu(entry->e_value_size));
213
214 memcpy(buffer,
215 (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs), len);
216 cp_len += len;
217
218 out:
219 return cp_len;
220 }
221
222 /*
223 * write the buffer to the inline inode.
224 * If 'create' is set, we don't need to do the extra copy in the xattr
225 * value since it is already handled by ext4_xattr_ibody_set.
226 * That saves us one memcpy.
227 */
ext4_write_inline_data(struct inode * inode,struct ext4_iloc * iloc,void * buffer,loff_t pos,unsigned int len)228 static void ext4_write_inline_data(struct inode *inode, struct ext4_iloc *iloc,
229 void *buffer, loff_t pos, unsigned int len)
230 {
231 struct ext4_xattr_entry *entry;
232 struct ext4_xattr_ibody_header *header;
233 struct ext4_inode *raw_inode;
234 int cp_len = 0;
235
236 if (unlikely(ext4_emergency_state(inode->i_sb)))
237 return;
238
239 BUG_ON(!EXT4_I(inode)->i_inline_off);
240 BUG_ON(pos + len > EXT4_I(inode)->i_inline_size);
241
242 raw_inode = ext4_raw_inode(iloc);
243 buffer += pos;
244
245 if (pos < EXT4_MIN_INLINE_DATA_SIZE) {
246 cp_len = pos + len > EXT4_MIN_INLINE_DATA_SIZE ?
247 EXT4_MIN_INLINE_DATA_SIZE - pos : len;
248 memcpy((void *)raw_inode->i_block + pos, buffer, cp_len);
249
250 len -= cp_len;
251 buffer += cp_len;
252 pos += cp_len;
253 }
254
255 if (!len)
256 return;
257
258 pos -= EXT4_MIN_INLINE_DATA_SIZE;
259 header = IHDR(inode, raw_inode);
260 entry = (struct ext4_xattr_entry *)((void *)raw_inode +
261 EXT4_I(inode)->i_inline_off);
262
263 memcpy((void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs) + pos,
264 buffer, len);
265 }
266
ext4_create_inline_data(handle_t * handle,struct inode * inode,unsigned len)267 static int ext4_create_inline_data(handle_t *handle,
268 struct inode *inode, unsigned len)
269 {
270 int error;
271 void *value = NULL;
272 struct ext4_xattr_ibody_find is = {
273 .s = { .not_found = -ENODATA, },
274 };
275 struct ext4_xattr_info i = {
276 .name_index = EXT4_XATTR_INDEX_SYSTEM,
277 .name = EXT4_XATTR_SYSTEM_DATA,
278 };
279
280 error = ext4_get_inode_loc(inode, &is.iloc);
281 if (error)
282 return error;
283
284 BUFFER_TRACE(is.iloc.bh, "get_write_access");
285 error = ext4_journal_get_write_access(handle, inode->i_sb, is.iloc.bh,
286 EXT4_JTR_NONE);
287 if (error)
288 goto out;
289
290 if (len > EXT4_MIN_INLINE_DATA_SIZE) {
291 value = EXT4_ZERO_XATTR_VALUE;
292 len -= EXT4_MIN_INLINE_DATA_SIZE;
293 } else {
294 value = "";
295 len = 0;
296 }
297
298 /* Insert the xttr entry. */
299 i.value = value;
300 i.value_len = len;
301
302 error = ext4_xattr_ibody_find(inode, &i, &is);
303 if (error)
304 goto out;
305
306 BUG_ON(!is.s.not_found);
307
308 error = ext4_xattr_ibody_set(handle, inode, &i, &is);
309 if (error) {
310 if (error == -ENOSPC)
311 ext4_clear_inode_state(inode,
312 EXT4_STATE_MAY_INLINE_DATA);
313 goto out;
314 }
315
316 memset((void *)ext4_raw_inode(&is.iloc)->i_block,
317 0, EXT4_MIN_INLINE_DATA_SIZE);
318
319 EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
320 (void *)ext4_raw_inode(&is.iloc));
321 EXT4_I(inode)->i_inline_size = len + EXT4_MIN_INLINE_DATA_SIZE;
322 ext4_clear_inode_flag(inode, EXT4_INODE_EXTENTS);
323 ext4_set_inode_flag(inode, EXT4_INODE_INLINE_DATA);
324 get_bh(is.iloc.bh);
325 error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
326
327 out:
328 brelse(is.iloc.bh);
329 return error;
330 }
331
ext4_update_inline_data(handle_t * handle,struct inode * inode,unsigned int len)332 static int ext4_update_inline_data(handle_t *handle, struct inode *inode,
333 unsigned int len)
334 {
335 int error;
336 void *value = NULL;
337 struct ext4_xattr_ibody_find is = {
338 .s = { .not_found = -ENODATA, },
339 };
340 struct ext4_xattr_info i = {
341 .name_index = EXT4_XATTR_INDEX_SYSTEM,
342 .name = EXT4_XATTR_SYSTEM_DATA,
343 };
344
345 /* If the old space is ok, write the data directly. */
346 if (len <= EXT4_I(inode)->i_inline_size)
347 return 0;
348
349 error = ext4_get_inode_loc(inode, &is.iloc);
350 if (error)
351 return error;
352
353 error = ext4_xattr_ibody_find(inode, &i, &is);
354 if (error)
355 goto out;
356
357 BUG_ON(is.s.not_found);
358
359 len -= EXT4_MIN_INLINE_DATA_SIZE;
360 value = kzalloc(len, GFP_NOFS);
361 if (!value) {
362 error = -ENOMEM;
363 goto out;
364 }
365
366 error = ext4_xattr_ibody_get(inode, i.name_index, i.name,
367 value, len);
368 if (error < 0)
369 goto out;
370
371 BUFFER_TRACE(is.iloc.bh, "get_write_access");
372 error = ext4_journal_get_write_access(handle, inode->i_sb, is.iloc.bh,
373 EXT4_JTR_NONE);
374 if (error)
375 goto out;
376
377 /* Update the xattr entry. */
378 i.value = value;
379 i.value_len = len;
380
381 error = ext4_xattr_ibody_set(handle, inode, &i, &is);
382 if (error)
383 goto out;
384
385 EXT4_I(inode)->i_inline_off = (u16)((void *)is.s.here -
386 (void *)ext4_raw_inode(&is.iloc));
387 EXT4_I(inode)->i_inline_size = EXT4_MIN_INLINE_DATA_SIZE +
388 le32_to_cpu(is.s.here->e_value_size);
389 ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
390 get_bh(is.iloc.bh);
391 error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
392
393 out:
394 kfree(value);
395 brelse(is.iloc.bh);
396 return error;
397 }
398
ext4_prepare_inline_data(handle_t * handle,struct inode * inode,unsigned int len)399 static int ext4_prepare_inline_data(handle_t *handle, struct inode *inode,
400 unsigned int len)
401 {
402 int ret, size, no_expand;
403 struct ext4_inode_info *ei = EXT4_I(inode);
404
405 if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA))
406 return -ENOSPC;
407
408 size = ext4_get_max_inline_size(inode);
409 if (size < len)
410 return -ENOSPC;
411
412 ext4_write_lock_xattr(inode, &no_expand);
413
414 if (ei->i_inline_off)
415 ret = ext4_update_inline_data(handle, inode, len);
416 else
417 ret = ext4_create_inline_data(handle, inode, len);
418
419 ext4_write_unlock_xattr(inode, &no_expand);
420 return ret;
421 }
422
ext4_destroy_inline_data_nolock(handle_t * handle,struct inode * inode)423 static int ext4_destroy_inline_data_nolock(handle_t *handle,
424 struct inode *inode)
425 {
426 struct ext4_inode_info *ei = EXT4_I(inode);
427 struct ext4_xattr_ibody_find is = {
428 .s = { .not_found = 0, },
429 };
430 struct ext4_xattr_info i = {
431 .name_index = EXT4_XATTR_INDEX_SYSTEM,
432 .name = EXT4_XATTR_SYSTEM_DATA,
433 .value = NULL,
434 .value_len = 0,
435 };
436 int error;
437
438 if (!ei->i_inline_off)
439 return 0;
440
441 error = ext4_get_inode_loc(inode, &is.iloc);
442 if (error)
443 return error;
444
445 error = ext4_xattr_ibody_find(inode, &i, &is);
446 if (error)
447 goto out;
448
449 BUFFER_TRACE(is.iloc.bh, "get_write_access");
450 error = ext4_journal_get_write_access(handle, inode->i_sb, is.iloc.bh,
451 EXT4_JTR_NONE);
452 if (error)
453 goto out;
454
455 error = ext4_xattr_ibody_set(handle, inode, &i, &is);
456 if (error)
457 goto out;
458
459 memset((void *)ext4_raw_inode(&is.iloc)->i_block,
460 0, EXT4_MIN_INLINE_DATA_SIZE);
461 memset(ei->i_data, 0, EXT4_MIN_INLINE_DATA_SIZE);
462
463 if (ext4_has_feature_extents(inode->i_sb)) {
464 if (S_ISDIR(inode->i_mode) ||
465 S_ISREG(inode->i_mode) || S_ISLNK(inode->i_mode)) {
466 ext4_set_inode_flag(inode, EXT4_INODE_EXTENTS);
467 ext4_ext_tree_init(handle, inode);
468 }
469 }
470 ext4_clear_inode_flag(inode, EXT4_INODE_INLINE_DATA);
471
472 get_bh(is.iloc.bh);
473 error = ext4_mark_iloc_dirty(handle, inode, &is.iloc);
474
475 EXT4_I(inode)->i_inline_off = 0;
476 EXT4_I(inode)->i_inline_size = 0;
477 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
478 out:
479 brelse(is.iloc.bh);
480 if (error == -ENODATA)
481 error = 0;
482 return error;
483 }
484
ext4_read_inline_folio(struct inode * inode,struct folio * folio)485 static int ext4_read_inline_folio(struct inode *inode, struct folio *folio)
486 {
487 void *kaddr;
488 int ret = 0;
489 size_t len;
490 struct ext4_iloc iloc;
491
492 BUG_ON(!folio_test_locked(folio));
493 BUG_ON(!ext4_has_inline_data(inode));
494 BUG_ON(folio->index);
495
496 if (!EXT4_I(inode)->i_inline_off) {
497 ext4_warning(inode->i_sb, "inode %lu doesn't have inline data.",
498 inode->i_ino);
499 goto out;
500 }
501
502 ret = ext4_get_inode_loc(inode, &iloc);
503 if (ret)
504 goto out;
505
506 len = min_t(size_t, ext4_get_inline_size(inode), i_size_read(inode));
507 BUG_ON(len > PAGE_SIZE);
508 kaddr = kmap_local_folio(folio, 0);
509 ret = ext4_read_inline_data(inode, kaddr, len, &iloc);
510 kaddr = folio_zero_tail(folio, len, kaddr + len);
511 kunmap_local(kaddr);
512 folio_mark_uptodate(folio);
513 brelse(iloc.bh);
514
515 out:
516 return ret;
517 }
518
ext4_readpage_inline(struct inode * inode,struct folio * folio)519 int ext4_readpage_inline(struct inode *inode, struct folio *folio)
520 {
521 int ret = 0;
522
523 down_read(&EXT4_I(inode)->xattr_sem);
524 if (!ext4_has_inline_data(inode)) {
525 up_read(&EXT4_I(inode)->xattr_sem);
526 return -EAGAIN;
527 }
528
529 /*
530 * Current inline data can only exist in the 1st page,
531 * So for all the other pages, just set them uptodate.
532 */
533 if (!folio->index)
534 ret = ext4_read_inline_folio(inode, folio);
535 else if (!folio_test_uptodate(folio)) {
536 folio_zero_segment(folio, 0, folio_size(folio));
537 folio_mark_uptodate(folio);
538 }
539
540 up_read(&EXT4_I(inode)->xattr_sem);
541
542 folio_unlock(folio);
543 return ret >= 0 ? 0 : ret;
544 }
545
ext4_convert_inline_data_to_extent(struct address_space * mapping,struct inode * inode)546 static int ext4_convert_inline_data_to_extent(struct address_space *mapping,
547 struct inode *inode)
548 {
549 int ret, needed_blocks, no_expand;
550 handle_t *handle = NULL;
551 int retries = 0, sem_held = 0;
552 struct folio *folio = NULL;
553 unsigned from, to;
554 struct ext4_iloc iloc;
555
556 if (!ext4_has_inline_data(inode)) {
557 /*
558 * clear the flag so that no new write
559 * will trap here again.
560 */
561 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
562 return 0;
563 }
564
565 needed_blocks = ext4_writepage_trans_blocks(inode);
566
567 ret = ext4_get_inode_loc(inode, &iloc);
568 if (ret)
569 return ret;
570
571 retry:
572 handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
573 if (IS_ERR(handle)) {
574 ret = PTR_ERR(handle);
575 handle = NULL;
576 goto out;
577 }
578
579 /* We cannot recurse into the filesystem as the transaction is already
580 * started */
581 folio = __filemap_get_folio(mapping, 0, FGP_WRITEBEGIN | FGP_NOFS,
582 mapping_gfp_mask(mapping));
583 if (IS_ERR(folio)) {
584 ret = PTR_ERR(folio);
585 goto out_nofolio;
586 }
587
588 ext4_write_lock_xattr(inode, &no_expand);
589 sem_held = 1;
590 /* If some one has already done this for us, just exit. */
591 if (!ext4_has_inline_data(inode)) {
592 ret = 0;
593 goto out;
594 }
595
596 from = 0;
597 to = ext4_get_inline_size(inode);
598 if (!folio_test_uptodate(folio)) {
599 ret = ext4_read_inline_folio(inode, folio);
600 if (ret < 0)
601 goto out;
602 }
603
604 ret = ext4_destroy_inline_data_nolock(handle, inode);
605 if (ret)
606 goto out;
607
608 if (ext4_should_dioread_nolock(inode)) {
609 ret = ext4_block_write_begin(handle, folio, from, to,
610 ext4_get_block_unwritten);
611 } else
612 ret = ext4_block_write_begin(handle, folio, from, to,
613 ext4_get_block);
614
615 if (!ret && ext4_should_journal_data(inode)) {
616 ret = ext4_walk_page_buffers(handle, inode,
617 folio_buffers(folio), from, to,
618 NULL, do_journal_get_write_access);
619 }
620
621 if (ret) {
622 folio_unlock(folio);
623 folio_put(folio);
624 folio = NULL;
625 ext4_orphan_add(handle, inode);
626 ext4_write_unlock_xattr(inode, &no_expand);
627 sem_held = 0;
628 ext4_journal_stop(handle);
629 handle = NULL;
630 ext4_truncate_failed_write(inode);
631 /*
632 * If truncate failed early the inode might
633 * still be on the orphan list; we need to
634 * make sure the inode is removed from the
635 * orphan list in that case.
636 */
637 if (inode->i_nlink)
638 ext4_orphan_del(NULL, inode);
639 }
640
641 if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
642 goto retry;
643
644 if (folio)
645 block_commit_write(&folio->page, from, to);
646 out:
647 if (folio) {
648 folio_unlock(folio);
649 folio_put(folio);
650 }
651 out_nofolio:
652 if (sem_held)
653 ext4_write_unlock_xattr(inode, &no_expand);
654 if (handle)
655 ext4_journal_stop(handle);
656 brelse(iloc.bh);
657 return ret;
658 }
659
660 /*
661 * Prepare the write for the inline data.
662 * If the data can be written into the inode, we just read
663 * the page and make it uptodate, and start the journal.
664 * Otherwise read the page, makes it dirty so that it can be
665 * handle in writepages(the i_disksize update is left to the
666 * normal ext4_da_write_end).
667 */
ext4_generic_write_inline_data(struct address_space * mapping,struct inode * inode,loff_t pos,unsigned len,struct folio ** foliop,void ** fsdata,bool da)668 int ext4_generic_write_inline_data(struct address_space *mapping,
669 struct inode *inode,
670 loff_t pos, unsigned len,
671 struct folio **foliop,
672 void **fsdata, bool da)
673 {
674 int ret;
675 handle_t *handle;
676 struct folio *folio;
677 struct ext4_iloc iloc;
678 int retries = 0;
679
680 ret = ext4_get_inode_loc(inode, &iloc);
681 if (ret)
682 return ret;
683
684 retry_journal:
685 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
686 if (IS_ERR(handle)) {
687 ret = PTR_ERR(handle);
688 goto out_release_bh;
689 }
690
691 ret = ext4_prepare_inline_data(handle, inode, pos + len);
692 if (ret && ret != -ENOSPC)
693 goto out_stop_journal;
694
695 if (ret == -ENOSPC) {
696 ext4_journal_stop(handle);
697 if (!da) {
698 brelse(iloc.bh);
699 /* Retry inside */
700 return ext4_convert_inline_data_to_extent(mapping, inode);
701 }
702
703 ret = ext4_da_convert_inline_data_to_extent(mapping, inode, fsdata);
704 if (ret == -ENOSPC &&
705 ext4_should_retry_alloc(inode->i_sb, &retries))
706 goto retry_journal;
707 goto out_release_bh;
708 }
709
710 folio = __filemap_get_folio(mapping, 0, FGP_WRITEBEGIN | FGP_NOFS,
711 mapping_gfp_mask(mapping));
712 if (IS_ERR(folio)) {
713 ret = PTR_ERR(folio);
714 goto out_stop_journal;
715 }
716
717 down_read(&EXT4_I(inode)->xattr_sem);
718 /* Someone else had converted it to extent */
719 if (!ext4_has_inline_data(inode)) {
720 ret = 0;
721 goto out_release_folio;
722 }
723
724 if (!folio_test_uptodate(folio)) {
725 ret = ext4_read_inline_folio(inode, folio);
726 if (ret < 0)
727 goto out_release_folio;
728 }
729
730 ret = ext4_journal_get_write_access(handle, inode->i_sb, iloc.bh, EXT4_JTR_NONE);
731 if (ret)
732 goto out_release_folio;
733 *foliop = folio;
734 up_read(&EXT4_I(inode)->xattr_sem);
735 brelse(iloc.bh);
736 return 1;
737
738 out_release_folio:
739 up_read(&EXT4_I(inode)->xattr_sem);
740 folio_unlock(folio);
741 folio_put(folio);
742 out_stop_journal:
743 ext4_journal_stop(handle);
744 out_release_bh:
745 brelse(iloc.bh);
746 return ret;
747 }
748
749 /*
750 * Try to write data in the inode.
751 * If the inode has inline data, check whether the new write can be
752 * in the inode also. If not, create the page the handle, move the data
753 * to the page make it update and let the later codes create extent for it.
754 */
ext4_try_to_write_inline_data(struct address_space * mapping,struct inode * inode,loff_t pos,unsigned len,struct folio ** foliop)755 int ext4_try_to_write_inline_data(struct address_space *mapping,
756 struct inode *inode,
757 loff_t pos, unsigned len,
758 struct folio **foliop)
759 {
760 if (pos + len > ext4_get_max_inline_size(inode))
761 return ext4_convert_inline_data_to_extent(mapping, inode);
762 return ext4_generic_write_inline_data(mapping, inode, pos, len,
763 foliop, NULL, false);
764 }
765
ext4_write_inline_data_end(struct inode * inode,loff_t pos,unsigned len,unsigned copied,struct folio * folio)766 int ext4_write_inline_data_end(struct inode *inode, loff_t pos, unsigned len,
767 unsigned copied, struct folio *folio)
768 {
769 handle_t *handle = ext4_journal_current_handle();
770 int no_expand;
771 void *kaddr;
772 struct ext4_iloc iloc;
773 int ret = 0, ret2;
774
775 if (unlikely(copied < len) && !folio_test_uptodate(folio))
776 copied = 0;
777
778 if (likely(copied)) {
779 ret = ext4_get_inode_loc(inode, &iloc);
780 if (ret) {
781 folio_unlock(folio);
782 folio_put(folio);
783 ext4_std_error(inode->i_sb, ret);
784 goto out;
785 }
786 ext4_write_lock_xattr(inode, &no_expand);
787 BUG_ON(!ext4_has_inline_data(inode));
788
789 /*
790 * ei->i_inline_off may have changed since
791 * ext4_write_begin() called
792 * ext4_try_to_write_inline_data()
793 */
794 (void) ext4_find_inline_data_nolock(inode);
795
796 kaddr = kmap_local_folio(folio, 0);
797 ext4_write_inline_data(inode, &iloc, kaddr, pos, copied);
798 kunmap_local(kaddr);
799 folio_mark_uptodate(folio);
800 /* clear dirty flag so that writepages wouldn't work for us. */
801 folio_clear_dirty(folio);
802
803 ext4_write_unlock_xattr(inode, &no_expand);
804 brelse(iloc.bh);
805
806 /*
807 * It's important to update i_size while still holding folio
808 * lock: page writeout could otherwise come in and zero
809 * beyond i_size.
810 */
811 ext4_update_inode_size(inode, pos + copied);
812 }
813 folio_unlock(folio);
814 folio_put(folio);
815
816 /*
817 * Don't mark the inode dirty under folio lock. First, it unnecessarily
818 * makes the holding time of folio lock longer. Second, it forces lock
819 * ordering of folio lock and transaction start for journaling
820 * filesystems.
821 */
822 if (likely(copied))
823 mark_inode_dirty(inode);
824 out:
825 /*
826 * If we didn't copy as much data as expected, we need to trim back
827 * size of xattr containing inline data.
828 */
829 if (pos + len > inode->i_size && ext4_can_truncate(inode))
830 ext4_orphan_add(handle, inode);
831
832 ret2 = ext4_journal_stop(handle);
833 if (!ret)
834 ret = ret2;
835 if (pos + len > inode->i_size) {
836 ext4_truncate_failed_write(inode);
837 /*
838 * If truncate failed early the inode might still be
839 * on the orphan list; we need to make sure the inode
840 * is removed from the orphan list in that case.
841 */
842 if (inode->i_nlink)
843 ext4_orphan_del(NULL, inode);
844 }
845 return ret ? ret : copied;
846 }
847
848 /*
849 * Try to make the page cache and handle ready for the inline data case.
850 * We can call this function in 2 cases:
851 * 1. The inode is created and the first write exceeds inline size. We can
852 * clear the inode state safely.
853 * 2. The inode has inline data, then we need to read the data, make it
854 * update and dirty so that ext4_da_writepages can handle it. We don't
855 * need to start the journal since the file's metadata isn't changed now.
856 */
ext4_da_convert_inline_data_to_extent(struct address_space * mapping,struct inode * inode,void ** fsdata)857 static int ext4_da_convert_inline_data_to_extent(struct address_space *mapping,
858 struct inode *inode,
859 void **fsdata)
860 {
861 int ret = 0, inline_size;
862 struct folio *folio;
863
864 folio = __filemap_get_folio(mapping, 0, FGP_WRITEBEGIN,
865 mapping_gfp_mask(mapping));
866 if (IS_ERR(folio))
867 return PTR_ERR(folio);
868
869 down_read(&EXT4_I(inode)->xattr_sem);
870 if (!ext4_has_inline_data(inode)) {
871 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
872 goto out;
873 }
874
875 inline_size = ext4_get_inline_size(inode);
876
877 if (!folio_test_uptodate(folio)) {
878 ret = ext4_read_inline_folio(inode, folio);
879 if (ret < 0)
880 goto out;
881 }
882
883 ret = ext4_block_write_begin(NULL, folio, 0, inline_size,
884 ext4_da_get_block_prep);
885 if (ret) {
886 up_read(&EXT4_I(inode)->xattr_sem);
887 folio_unlock(folio);
888 folio_put(folio);
889 ext4_truncate_failed_write(inode);
890 return ret;
891 }
892
893 folio_mark_dirty(folio);
894 folio_mark_uptodate(folio);
895 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
896 *fsdata = (void *)CONVERT_INLINE_DATA;
897
898 out:
899 up_read(&EXT4_I(inode)->xattr_sem);
900 if (folio) {
901 folio_unlock(folio);
902 folio_put(folio);
903 }
904 return ret;
905 }
906
907 #ifdef INLINE_DIR_DEBUG
ext4_show_inline_dir(struct inode * dir,struct buffer_head * bh,void * inline_start,int inline_size)908 void ext4_show_inline_dir(struct inode *dir, struct buffer_head *bh,
909 void *inline_start, int inline_size)
910 {
911 int offset;
912 unsigned short de_len;
913 struct ext4_dir_entry_2 *de = inline_start;
914 void *dlimit = inline_start + inline_size;
915
916 trace_printk("inode %lu\n", dir->i_ino);
917 offset = 0;
918 while ((void *)de < dlimit) {
919 de_len = ext4_rec_len_from_disk(de->rec_len, inline_size);
920 trace_printk("de: off %u rlen %u name %.*s nlen %u ino %u\n",
921 offset, de_len, de->name_len, de->name,
922 de->name_len, le32_to_cpu(de->inode));
923 if (ext4_check_dir_entry(dir, NULL, de, bh,
924 inline_start, inline_size, offset))
925 BUG();
926
927 offset += de_len;
928 de = (struct ext4_dir_entry_2 *) ((char *) de + de_len);
929 }
930 }
931 #else
932 #define ext4_show_inline_dir(dir, bh, inline_start, inline_size)
933 #endif
934
935 /*
936 * Add a new entry into a inline dir.
937 * It will return -ENOSPC if no space is available, and -EIO
938 * and -EEXIST if directory entry already exists.
939 */
ext4_add_dirent_to_inline(handle_t * handle,struct ext4_filename * fname,struct inode * dir,struct inode * inode,struct ext4_iloc * iloc,void * inline_start,int inline_size)940 static int ext4_add_dirent_to_inline(handle_t *handle,
941 struct ext4_filename *fname,
942 struct inode *dir,
943 struct inode *inode,
944 struct ext4_iloc *iloc,
945 void *inline_start, int inline_size)
946 {
947 int err;
948 struct ext4_dir_entry_2 *de;
949
950 err = ext4_find_dest_de(dir, iloc->bh, inline_start,
951 inline_size, fname, &de);
952 if (err)
953 return err;
954
955 BUFFER_TRACE(iloc->bh, "get_write_access");
956 err = ext4_journal_get_write_access(handle, dir->i_sb, iloc->bh,
957 EXT4_JTR_NONE);
958 if (err)
959 return err;
960 ext4_insert_dentry(dir, inode, de, inline_size, fname);
961
962 ext4_show_inline_dir(dir, iloc->bh, inline_start, inline_size);
963
964 /*
965 * XXX shouldn't update any times until successful
966 * completion of syscall, but too many callers depend
967 * on this.
968 *
969 * XXX similarly, too many callers depend on
970 * ext4_new_inode() setting the times, but error
971 * recovery deletes the inode, so the worst that can
972 * happen is that the times are slightly out of date
973 * and/or different from the directory change time.
974 */
975 inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir));
976 ext4_update_dx_flag(dir);
977 inode_inc_iversion(dir);
978 return 1;
979 }
980
ext4_get_inline_xattr_pos(struct inode * inode,struct ext4_iloc * iloc)981 static void *ext4_get_inline_xattr_pos(struct inode *inode,
982 struct ext4_iloc *iloc)
983 {
984 struct ext4_xattr_entry *entry;
985 struct ext4_xattr_ibody_header *header;
986
987 BUG_ON(!EXT4_I(inode)->i_inline_off);
988
989 header = IHDR(inode, ext4_raw_inode(iloc));
990 entry = (struct ext4_xattr_entry *)((void *)ext4_raw_inode(iloc) +
991 EXT4_I(inode)->i_inline_off);
992
993 return (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs);
994 }
995
996 /* Set the final de to cover the whole block. */
ext4_update_final_de(void * de_buf,int old_size,int new_size)997 static void ext4_update_final_de(void *de_buf, int old_size, int new_size)
998 {
999 struct ext4_dir_entry_2 *de, *prev_de;
1000 void *limit;
1001 int de_len;
1002
1003 de = de_buf;
1004 if (old_size) {
1005 limit = de_buf + old_size;
1006 do {
1007 prev_de = de;
1008 de_len = ext4_rec_len_from_disk(de->rec_len, old_size);
1009 de_buf += de_len;
1010 de = de_buf;
1011 } while (de_buf < limit);
1012
1013 prev_de->rec_len = ext4_rec_len_to_disk(de_len + new_size -
1014 old_size, new_size);
1015 } else {
1016 /* this is just created, so create an empty entry. */
1017 de->inode = 0;
1018 de->rec_len = ext4_rec_len_to_disk(new_size, new_size);
1019 }
1020 }
1021
ext4_update_inline_dir(handle_t * handle,struct inode * dir,struct ext4_iloc * iloc)1022 static int ext4_update_inline_dir(handle_t *handle, struct inode *dir,
1023 struct ext4_iloc *iloc)
1024 {
1025 int ret;
1026 int old_size = EXT4_I(dir)->i_inline_size - EXT4_MIN_INLINE_DATA_SIZE;
1027 int new_size = get_max_inline_xattr_value_size(dir, iloc);
1028
1029 if (new_size - old_size <= ext4_dir_rec_len(1, NULL))
1030 return -ENOSPC;
1031
1032 ret = ext4_update_inline_data(handle, dir,
1033 new_size + EXT4_MIN_INLINE_DATA_SIZE);
1034 if (ret)
1035 return ret;
1036
1037 ext4_update_final_de(ext4_get_inline_xattr_pos(dir, iloc), old_size,
1038 EXT4_I(dir)->i_inline_size -
1039 EXT4_MIN_INLINE_DATA_SIZE);
1040 dir->i_size = EXT4_I(dir)->i_disksize = EXT4_I(dir)->i_inline_size;
1041 return 0;
1042 }
1043
ext4_restore_inline_data(handle_t * handle,struct inode * inode,struct ext4_iloc * iloc,void * buf,int inline_size)1044 static void ext4_restore_inline_data(handle_t *handle, struct inode *inode,
1045 struct ext4_iloc *iloc,
1046 void *buf, int inline_size)
1047 {
1048 int ret;
1049
1050 ret = ext4_create_inline_data(handle, inode, inline_size);
1051 if (ret) {
1052 ext4_msg(inode->i_sb, KERN_EMERG,
1053 "error restoring inline_data for inode -- potential data loss! (inode %lu, error %d)",
1054 inode->i_ino, ret);
1055 return;
1056 }
1057 ext4_write_inline_data(inode, iloc, buf, 0, inline_size);
1058 ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1059 }
1060
ext4_finish_convert_inline_dir(handle_t * handle,struct inode * inode,struct buffer_head * dir_block,void * buf,int inline_size)1061 static int ext4_finish_convert_inline_dir(handle_t *handle,
1062 struct inode *inode,
1063 struct buffer_head *dir_block,
1064 void *buf,
1065 int inline_size)
1066 {
1067 int err, csum_size = 0, header_size = 0;
1068 struct ext4_dir_entry_2 *de;
1069 void *target = dir_block->b_data;
1070
1071 /*
1072 * First create "." and ".." and then copy the dir information
1073 * back to the block.
1074 */
1075 de = target;
1076 de = ext4_init_dot_dotdot(inode, de,
1077 inode->i_sb->s_blocksize, csum_size,
1078 le32_to_cpu(((struct ext4_dir_entry_2 *)buf)->inode), 1);
1079 header_size = (void *)de - target;
1080
1081 memcpy((void *)de, buf + EXT4_INLINE_DOTDOT_SIZE,
1082 inline_size - EXT4_INLINE_DOTDOT_SIZE);
1083
1084 if (ext4_has_feature_metadata_csum(inode->i_sb))
1085 csum_size = sizeof(struct ext4_dir_entry_tail);
1086
1087 inode->i_size = inode->i_sb->s_blocksize;
1088 i_size_write(inode, inode->i_sb->s_blocksize);
1089 EXT4_I(inode)->i_disksize = inode->i_sb->s_blocksize;
1090 ext4_update_final_de(dir_block->b_data,
1091 inline_size - EXT4_INLINE_DOTDOT_SIZE + header_size,
1092 inode->i_sb->s_blocksize - csum_size);
1093
1094 if (csum_size)
1095 ext4_initialize_dirent_tail(dir_block,
1096 inode->i_sb->s_blocksize);
1097 set_buffer_uptodate(dir_block);
1098 unlock_buffer(dir_block);
1099 err = ext4_handle_dirty_dirblock(handle, inode, dir_block);
1100 if (err)
1101 return err;
1102 set_buffer_verified(dir_block);
1103 return ext4_mark_inode_dirty(handle, inode);
1104 }
1105
ext4_convert_inline_data_nolock(handle_t * handle,struct inode * inode,struct ext4_iloc * iloc)1106 static int ext4_convert_inline_data_nolock(handle_t *handle,
1107 struct inode *inode,
1108 struct ext4_iloc *iloc)
1109 {
1110 int error;
1111 void *buf = NULL;
1112 struct buffer_head *data_bh = NULL;
1113 struct ext4_map_blocks map;
1114 int inline_size;
1115
1116 inline_size = ext4_get_inline_size(inode);
1117 buf = kmalloc(inline_size, GFP_NOFS);
1118 if (!buf) {
1119 error = -ENOMEM;
1120 goto out;
1121 }
1122
1123 error = ext4_read_inline_data(inode, buf, inline_size, iloc);
1124 if (error < 0)
1125 goto out;
1126
1127 /*
1128 * Make sure the inline directory entries pass checks before we try to
1129 * convert them, so that we avoid touching stuff that needs fsck.
1130 */
1131 if (S_ISDIR(inode->i_mode)) {
1132 error = ext4_check_all_de(inode, iloc->bh,
1133 buf + EXT4_INLINE_DOTDOT_SIZE,
1134 inline_size - EXT4_INLINE_DOTDOT_SIZE);
1135 if (error)
1136 goto out;
1137 }
1138
1139 error = ext4_destroy_inline_data_nolock(handle, inode);
1140 if (error)
1141 goto out;
1142
1143 map.m_lblk = 0;
1144 map.m_len = 1;
1145 map.m_flags = 0;
1146 error = ext4_map_blocks(handle, inode, &map, EXT4_GET_BLOCKS_CREATE);
1147 if (error < 0)
1148 goto out_restore;
1149 if (!(map.m_flags & EXT4_MAP_MAPPED)) {
1150 error = -EIO;
1151 goto out_restore;
1152 }
1153
1154 data_bh = sb_getblk(inode->i_sb, map.m_pblk);
1155 if (!data_bh) {
1156 error = -ENOMEM;
1157 goto out_restore;
1158 }
1159
1160 lock_buffer(data_bh);
1161 error = ext4_journal_get_create_access(handle, inode->i_sb, data_bh,
1162 EXT4_JTR_NONE);
1163 if (error) {
1164 unlock_buffer(data_bh);
1165 error = -EIO;
1166 goto out_restore;
1167 }
1168 memset(data_bh->b_data, 0, inode->i_sb->s_blocksize);
1169
1170 if (!S_ISDIR(inode->i_mode)) {
1171 memcpy(data_bh->b_data, buf, inline_size);
1172 set_buffer_uptodate(data_bh);
1173 unlock_buffer(data_bh);
1174 error = ext4_handle_dirty_metadata(handle,
1175 inode, data_bh);
1176 } else {
1177 error = ext4_finish_convert_inline_dir(handle, inode, data_bh,
1178 buf, inline_size);
1179 }
1180
1181 out_restore:
1182 if (error)
1183 ext4_restore_inline_data(handle, inode, iloc, buf, inline_size);
1184
1185 out:
1186 brelse(data_bh);
1187 kfree(buf);
1188 return error;
1189 }
1190
1191 /*
1192 * Try to add the new entry to the inline data.
1193 * If succeeds, return 0. If not, extended the inline dir and copied data to
1194 * the new created block.
1195 */
ext4_try_add_inline_entry(handle_t * handle,struct ext4_filename * fname,struct inode * dir,struct inode * inode)1196 int ext4_try_add_inline_entry(handle_t *handle, struct ext4_filename *fname,
1197 struct inode *dir, struct inode *inode)
1198 {
1199 int ret, ret2, inline_size, no_expand;
1200 void *inline_start;
1201 struct ext4_iloc iloc;
1202
1203 ret = ext4_get_inode_loc(dir, &iloc);
1204 if (ret)
1205 return ret;
1206
1207 ext4_write_lock_xattr(dir, &no_expand);
1208 if (!ext4_has_inline_data(dir))
1209 goto out;
1210
1211 inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1212 EXT4_INLINE_DOTDOT_SIZE;
1213 inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1214
1215 ret = ext4_add_dirent_to_inline(handle, fname, dir, inode, &iloc,
1216 inline_start, inline_size);
1217 if (ret != -ENOSPC)
1218 goto out;
1219
1220 /* check whether it can be inserted to inline xattr space. */
1221 inline_size = EXT4_I(dir)->i_inline_size -
1222 EXT4_MIN_INLINE_DATA_SIZE;
1223 if (!inline_size) {
1224 /* Try to use the xattr space.*/
1225 ret = ext4_update_inline_dir(handle, dir, &iloc);
1226 if (ret && ret != -ENOSPC)
1227 goto out;
1228
1229 inline_size = EXT4_I(dir)->i_inline_size -
1230 EXT4_MIN_INLINE_DATA_SIZE;
1231 }
1232
1233 if (inline_size) {
1234 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1235
1236 ret = ext4_add_dirent_to_inline(handle, fname, dir,
1237 inode, &iloc, inline_start,
1238 inline_size);
1239
1240 if (ret != -ENOSPC)
1241 goto out;
1242 }
1243
1244 /*
1245 * The inline space is filled up, so create a new block for it.
1246 * As the extent tree will be created, we have to save the inline
1247 * dir first.
1248 */
1249 ret = ext4_convert_inline_data_nolock(handle, dir, &iloc);
1250
1251 out:
1252 ext4_write_unlock_xattr(dir, &no_expand);
1253 ret2 = ext4_mark_inode_dirty(handle, dir);
1254 if (unlikely(ret2 && !ret))
1255 ret = ret2;
1256 brelse(iloc.bh);
1257 return ret;
1258 }
1259
1260 /*
1261 * This function fills a red-black tree with information from an
1262 * inlined dir. It returns the number directory entries loaded
1263 * into the tree. If there is an error it is returned in err.
1264 */
ext4_inlinedir_to_tree(struct file * dir_file,struct inode * dir,ext4_lblk_t block,struct dx_hash_info * hinfo,__u32 start_hash,__u32 start_minor_hash,int * has_inline_data)1265 int ext4_inlinedir_to_tree(struct file *dir_file,
1266 struct inode *dir, ext4_lblk_t block,
1267 struct dx_hash_info *hinfo,
1268 __u32 start_hash, __u32 start_minor_hash,
1269 int *has_inline_data)
1270 {
1271 int err = 0, count = 0;
1272 unsigned int parent_ino;
1273 int pos;
1274 struct ext4_dir_entry_2 *de;
1275 struct inode *inode = file_inode(dir_file);
1276 int ret, inline_size = 0;
1277 struct ext4_iloc iloc;
1278 void *dir_buf = NULL;
1279 struct ext4_dir_entry_2 fake;
1280 struct fscrypt_str tmp_str;
1281
1282 ret = ext4_get_inode_loc(inode, &iloc);
1283 if (ret)
1284 return ret;
1285
1286 down_read(&EXT4_I(inode)->xattr_sem);
1287 if (!ext4_has_inline_data(inode)) {
1288 up_read(&EXT4_I(inode)->xattr_sem);
1289 *has_inline_data = 0;
1290 goto out;
1291 }
1292
1293 inline_size = ext4_get_inline_size(inode);
1294 dir_buf = kmalloc(inline_size, GFP_NOFS);
1295 if (!dir_buf) {
1296 ret = -ENOMEM;
1297 up_read(&EXT4_I(inode)->xattr_sem);
1298 goto out;
1299 }
1300
1301 ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1302 up_read(&EXT4_I(inode)->xattr_sem);
1303 if (ret < 0)
1304 goto out;
1305
1306 pos = 0;
1307 parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1308 while (pos < inline_size) {
1309 /*
1310 * As inlined dir doesn't store any information about '.' and
1311 * only the inode number of '..' is stored, we have to handle
1312 * them differently.
1313 */
1314 if (pos == 0) {
1315 fake.inode = cpu_to_le32(inode->i_ino);
1316 fake.name_len = 1;
1317 strcpy(fake.name, ".");
1318 fake.rec_len = ext4_rec_len_to_disk(
1319 ext4_dir_rec_len(fake.name_len, NULL),
1320 inline_size);
1321 ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1322 de = &fake;
1323 pos = EXT4_INLINE_DOTDOT_OFFSET;
1324 } else if (pos == EXT4_INLINE_DOTDOT_OFFSET) {
1325 fake.inode = cpu_to_le32(parent_ino);
1326 fake.name_len = 2;
1327 strcpy(fake.name, "..");
1328 fake.rec_len = ext4_rec_len_to_disk(
1329 ext4_dir_rec_len(fake.name_len, NULL),
1330 inline_size);
1331 ext4_set_de_type(inode->i_sb, &fake, S_IFDIR);
1332 de = &fake;
1333 pos = EXT4_INLINE_DOTDOT_SIZE;
1334 } else {
1335 de = (struct ext4_dir_entry_2 *)(dir_buf + pos);
1336 pos += ext4_rec_len_from_disk(de->rec_len, inline_size);
1337 if (ext4_check_dir_entry(inode, dir_file, de,
1338 iloc.bh, dir_buf,
1339 inline_size, pos)) {
1340 ret = count;
1341 goto out;
1342 }
1343 }
1344
1345 if (ext4_hash_in_dirent(dir)) {
1346 hinfo->hash = EXT4_DIRENT_HASH(de);
1347 hinfo->minor_hash = EXT4_DIRENT_MINOR_HASH(de);
1348 } else {
1349 err = ext4fs_dirhash(dir, de->name, de->name_len, hinfo);
1350 if (err) {
1351 ret = err;
1352 goto out;
1353 }
1354 }
1355 if ((hinfo->hash < start_hash) ||
1356 ((hinfo->hash == start_hash) &&
1357 (hinfo->minor_hash < start_minor_hash)))
1358 continue;
1359 if (de->inode == 0)
1360 continue;
1361 tmp_str.name = de->name;
1362 tmp_str.len = de->name_len;
1363 err = ext4_htree_store_dirent(dir_file, hinfo->hash,
1364 hinfo->minor_hash, de, &tmp_str);
1365 if (err) {
1366 ret = err;
1367 goto out;
1368 }
1369 count++;
1370 }
1371 ret = count;
1372 out:
1373 kfree(dir_buf);
1374 brelse(iloc.bh);
1375 return ret;
1376 }
1377
1378 /*
1379 * So this function is called when the volume is mkfsed with
1380 * dir_index disabled. In order to keep f_pos persistent
1381 * after we convert from an inlined dir to a blocked based,
1382 * we just pretend that we are a normal dir and return the
1383 * offset as if '.' and '..' really take place.
1384 *
1385 */
ext4_read_inline_dir(struct file * file,struct dir_context * ctx,int * has_inline_data)1386 int ext4_read_inline_dir(struct file *file,
1387 struct dir_context *ctx,
1388 int *has_inline_data)
1389 {
1390 unsigned int offset, parent_ino;
1391 int i;
1392 struct ext4_dir_entry_2 *de;
1393 struct super_block *sb;
1394 struct inode *inode = file_inode(file);
1395 int ret, inline_size = 0;
1396 struct ext4_iloc iloc;
1397 void *dir_buf = NULL;
1398 int dotdot_offset, dotdot_size, extra_offset, extra_size;
1399 struct dir_private_info *info = file->private_data;
1400
1401 ret = ext4_get_inode_loc(inode, &iloc);
1402 if (ret)
1403 return ret;
1404
1405 down_read(&EXT4_I(inode)->xattr_sem);
1406 if (!ext4_has_inline_data(inode)) {
1407 up_read(&EXT4_I(inode)->xattr_sem);
1408 *has_inline_data = 0;
1409 goto out;
1410 }
1411
1412 inline_size = ext4_get_inline_size(inode);
1413 dir_buf = kmalloc(inline_size, GFP_NOFS);
1414 if (!dir_buf) {
1415 ret = -ENOMEM;
1416 up_read(&EXT4_I(inode)->xattr_sem);
1417 goto out;
1418 }
1419
1420 ret = ext4_read_inline_data(inode, dir_buf, inline_size, &iloc);
1421 up_read(&EXT4_I(inode)->xattr_sem);
1422 if (ret < 0)
1423 goto out;
1424
1425 ret = 0;
1426 sb = inode->i_sb;
1427 parent_ino = le32_to_cpu(((struct ext4_dir_entry_2 *)dir_buf)->inode);
1428 offset = ctx->pos;
1429
1430 /*
1431 * dotdot_offset and dotdot_size is the real offset and
1432 * size for ".." and "." if the dir is block based while
1433 * the real size for them are only EXT4_INLINE_DOTDOT_SIZE.
1434 * So we will use extra_offset and extra_size to indicate them
1435 * during the inline dir iteration.
1436 */
1437 dotdot_offset = ext4_dir_rec_len(1, NULL);
1438 dotdot_size = dotdot_offset + ext4_dir_rec_len(2, NULL);
1439 extra_offset = dotdot_size - EXT4_INLINE_DOTDOT_SIZE;
1440 extra_size = extra_offset + inline_size;
1441
1442 /*
1443 * If the cookie has changed since the last call to
1444 * readdir(2), then we might be pointing to an invalid
1445 * dirent right now. Scan from the start of the inline
1446 * dir to make sure.
1447 */
1448 if (!inode_eq_iversion(inode, info->cookie)) {
1449 for (i = 0; i < extra_size && i < offset;) {
1450 /*
1451 * "." is with offset 0 and
1452 * ".." is dotdot_offset.
1453 */
1454 if (!i) {
1455 i = dotdot_offset;
1456 continue;
1457 } else if (i == dotdot_offset) {
1458 i = dotdot_size;
1459 continue;
1460 }
1461 /* for other entry, the real offset in
1462 * the buf has to be tuned accordingly.
1463 */
1464 de = (struct ext4_dir_entry_2 *)
1465 (dir_buf + i - extra_offset);
1466 /* It's too expensive to do a full
1467 * dirent test each time round this
1468 * loop, but we do have to test at
1469 * least that it is non-zero. A
1470 * failure will be detected in the
1471 * dirent test below. */
1472 if (ext4_rec_len_from_disk(de->rec_len, extra_size)
1473 < ext4_dir_rec_len(1, NULL))
1474 break;
1475 i += ext4_rec_len_from_disk(de->rec_len,
1476 extra_size);
1477 }
1478 offset = i;
1479 ctx->pos = offset;
1480 info->cookie = inode_query_iversion(inode);
1481 }
1482
1483 while (ctx->pos < extra_size) {
1484 if (ctx->pos == 0) {
1485 if (!dir_emit(ctx, ".", 1, inode->i_ino, DT_DIR))
1486 goto out;
1487 ctx->pos = dotdot_offset;
1488 continue;
1489 }
1490
1491 if (ctx->pos == dotdot_offset) {
1492 if (!dir_emit(ctx, "..", 2, parent_ino, DT_DIR))
1493 goto out;
1494 ctx->pos = dotdot_size;
1495 continue;
1496 }
1497
1498 de = (struct ext4_dir_entry_2 *)
1499 (dir_buf + ctx->pos - extra_offset);
1500 if (ext4_check_dir_entry(inode, file, de, iloc.bh, dir_buf,
1501 extra_size, ctx->pos))
1502 goto out;
1503 if (le32_to_cpu(de->inode)) {
1504 if (!dir_emit(ctx, de->name, de->name_len,
1505 le32_to_cpu(de->inode),
1506 get_dtype(sb, de->file_type)))
1507 goto out;
1508 }
1509 ctx->pos += ext4_rec_len_from_disk(de->rec_len, extra_size);
1510 }
1511 out:
1512 kfree(dir_buf);
1513 brelse(iloc.bh);
1514 return ret;
1515 }
1516
ext4_read_inline_link(struct inode * inode)1517 void *ext4_read_inline_link(struct inode *inode)
1518 {
1519 struct ext4_iloc iloc;
1520 int ret, inline_size;
1521 void *link;
1522
1523 ret = ext4_get_inode_loc(inode, &iloc);
1524 if (ret)
1525 return ERR_PTR(ret);
1526
1527 ret = -ENOMEM;
1528 inline_size = ext4_get_inline_size(inode);
1529 link = kmalloc(inline_size + 1, GFP_NOFS);
1530 if (!link)
1531 goto out;
1532
1533 ret = ext4_read_inline_data(inode, link, inline_size, &iloc);
1534 if (ret < 0) {
1535 kfree(link);
1536 goto out;
1537 }
1538 nd_terminate_link(link, inode->i_size, ret);
1539 out:
1540 if (ret < 0)
1541 link = ERR_PTR(ret);
1542 brelse(iloc.bh);
1543 return link;
1544 }
1545
ext4_get_first_inline_block(struct inode * inode,struct ext4_dir_entry_2 ** parent_de,int * retval)1546 struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
1547 struct ext4_dir_entry_2 **parent_de,
1548 int *retval)
1549 {
1550 struct ext4_iloc iloc;
1551
1552 *retval = ext4_get_inode_loc(inode, &iloc);
1553 if (*retval)
1554 return NULL;
1555
1556 *parent_de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1557
1558 return iloc.bh;
1559 }
1560
1561 /*
1562 * Try to create the inline data for the new dir.
1563 * If it succeeds, return 0, otherwise return the error.
1564 * In case of ENOSPC, the caller should create the normal disk layout dir.
1565 */
ext4_try_create_inline_dir(handle_t * handle,struct inode * parent,struct inode * inode)1566 int ext4_try_create_inline_dir(handle_t *handle, struct inode *parent,
1567 struct inode *inode)
1568 {
1569 int ret, inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1570 struct ext4_iloc iloc;
1571 struct ext4_dir_entry_2 *de;
1572
1573 ret = ext4_get_inode_loc(inode, &iloc);
1574 if (ret)
1575 return ret;
1576
1577 ret = ext4_prepare_inline_data(handle, inode, inline_size);
1578 if (ret)
1579 goto out;
1580
1581 /*
1582 * For inline dir, we only save the inode information for the ".."
1583 * and create a fake dentry to cover the left space.
1584 */
1585 de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1586 de->inode = cpu_to_le32(parent->i_ino);
1587 de = (struct ext4_dir_entry_2 *)((void *)de + EXT4_INLINE_DOTDOT_SIZE);
1588 de->inode = 0;
1589 de->rec_len = ext4_rec_len_to_disk(
1590 inline_size - EXT4_INLINE_DOTDOT_SIZE,
1591 inline_size);
1592 set_nlink(inode, 2);
1593 inode->i_size = EXT4_I(inode)->i_disksize = inline_size;
1594 out:
1595 brelse(iloc.bh);
1596 return ret;
1597 }
1598
ext4_find_inline_entry(struct inode * dir,struct ext4_filename * fname,struct ext4_dir_entry_2 ** res_dir,int * has_inline_data)1599 struct buffer_head *ext4_find_inline_entry(struct inode *dir,
1600 struct ext4_filename *fname,
1601 struct ext4_dir_entry_2 **res_dir,
1602 int *has_inline_data)
1603 {
1604 struct ext4_xattr_ibody_find is = {
1605 .s = { .not_found = -ENODATA, },
1606 };
1607 struct ext4_xattr_info i = {
1608 .name_index = EXT4_XATTR_INDEX_SYSTEM,
1609 .name = EXT4_XATTR_SYSTEM_DATA,
1610 };
1611 int ret;
1612 void *inline_start;
1613 int inline_size;
1614
1615 ret = ext4_get_inode_loc(dir, &is.iloc);
1616 if (ret)
1617 return ERR_PTR(ret);
1618
1619 down_read(&EXT4_I(dir)->xattr_sem);
1620
1621 ret = ext4_xattr_ibody_find(dir, &i, &is);
1622 if (ret)
1623 goto out;
1624
1625 if (!ext4_has_inline_data(dir)) {
1626 *has_inline_data = 0;
1627 goto out;
1628 }
1629
1630 inline_start = (void *)ext4_raw_inode(&is.iloc)->i_block +
1631 EXT4_INLINE_DOTDOT_SIZE;
1632 inline_size = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DOTDOT_SIZE;
1633 ret = ext4_search_dir(is.iloc.bh, inline_start, inline_size,
1634 dir, fname, 0, res_dir);
1635 if (ret == 1)
1636 goto out_find;
1637 if (ret < 0)
1638 goto out;
1639
1640 if (ext4_get_inline_size(dir) == EXT4_MIN_INLINE_DATA_SIZE)
1641 goto out;
1642
1643 inline_start = ext4_get_inline_xattr_pos(dir, &is.iloc);
1644 inline_size = ext4_get_inline_size(dir) - EXT4_MIN_INLINE_DATA_SIZE;
1645
1646 ret = ext4_search_dir(is.iloc.bh, inline_start, inline_size,
1647 dir, fname, 0, res_dir);
1648 if (ret == 1)
1649 goto out_find;
1650
1651 out:
1652 brelse(is.iloc.bh);
1653 if (ret < 0)
1654 is.iloc.bh = ERR_PTR(ret);
1655 else
1656 is.iloc.bh = NULL;
1657 out_find:
1658 up_read(&EXT4_I(dir)->xattr_sem);
1659 return is.iloc.bh;
1660 }
1661
ext4_delete_inline_entry(handle_t * handle,struct inode * dir,struct ext4_dir_entry_2 * de_del,struct buffer_head * bh,int * has_inline_data)1662 int ext4_delete_inline_entry(handle_t *handle,
1663 struct inode *dir,
1664 struct ext4_dir_entry_2 *de_del,
1665 struct buffer_head *bh,
1666 int *has_inline_data)
1667 {
1668 int err, inline_size, no_expand;
1669 struct ext4_iloc iloc;
1670 void *inline_start;
1671
1672 err = ext4_get_inode_loc(dir, &iloc);
1673 if (err)
1674 return err;
1675
1676 ext4_write_lock_xattr(dir, &no_expand);
1677 if (!ext4_has_inline_data(dir)) {
1678 *has_inline_data = 0;
1679 goto out;
1680 }
1681
1682 if ((void *)de_del - ((void *)ext4_raw_inode(&iloc)->i_block) <
1683 EXT4_MIN_INLINE_DATA_SIZE) {
1684 inline_start = (void *)ext4_raw_inode(&iloc)->i_block +
1685 EXT4_INLINE_DOTDOT_SIZE;
1686 inline_size = EXT4_MIN_INLINE_DATA_SIZE -
1687 EXT4_INLINE_DOTDOT_SIZE;
1688 } else {
1689 inline_start = ext4_get_inline_xattr_pos(dir, &iloc);
1690 inline_size = ext4_get_inline_size(dir) -
1691 EXT4_MIN_INLINE_DATA_SIZE;
1692 }
1693
1694 BUFFER_TRACE(bh, "get_write_access");
1695 err = ext4_journal_get_write_access(handle, dir->i_sb, bh,
1696 EXT4_JTR_NONE);
1697 if (err)
1698 goto out;
1699
1700 err = ext4_generic_delete_entry(dir, de_del, bh,
1701 inline_start, inline_size, 0);
1702 if (err)
1703 goto out;
1704
1705 ext4_show_inline_dir(dir, iloc.bh, inline_start, inline_size);
1706 out:
1707 ext4_write_unlock_xattr(dir, &no_expand);
1708 if (likely(err == 0))
1709 err = ext4_mark_inode_dirty(handle, dir);
1710 brelse(iloc.bh);
1711 if (err != -ENOENT)
1712 ext4_std_error(dir->i_sb, err);
1713 return err;
1714 }
1715
1716 /*
1717 * Get the inline dentry at offset.
1718 */
1719 static inline struct ext4_dir_entry_2 *
ext4_get_inline_entry(struct inode * inode,struct ext4_iloc * iloc,unsigned int offset,void ** inline_start,int * inline_size)1720 ext4_get_inline_entry(struct inode *inode,
1721 struct ext4_iloc *iloc,
1722 unsigned int offset,
1723 void **inline_start,
1724 int *inline_size)
1725 {
1726 void *inline_pos;
1727
1728 BUG_ON(offset > ext4_get_inline_size(inode));
1729
1730 if (offset < EXT4_MIN_INLINE_DATA_SIZE) {
1731 inline_pos = (void *)ext4_raw_inode(iloc)->i_block;
1732 *inline_size = EXT4_MIN_INLINE_DATA_SIZE;
1733 } else {
1734 inline_pos = ext4_get_inline_xattr_pos(inode, iloc);
1735 offset -= EXT4_MIN_INLINE_DATA_SIZE;
1736 *inline_size = ext4_get_inline_size(inode) -
1737 EXT4_MIN_INLINE_DATA_SIZE;
1738 }
1739
1740 if (inline_start)
1741 *inline_start = inline_pos;
1742 return (struct ext4_dir_entry_2 *)(inline_pos + offset);
1743 }
1744
empty_inline_dir(struct inode * dir,int * has_inline_data)1745 bool empty_inline_dir(struct inode *dir, int *has_inline_data)
1746 {
1747 int err, inline_size;
1748 struct ext4_iloc iloc;
1749 size_t inline_len;
1750 void *inline_pos;
1751 unsigned int offset;
1752 struct ext4_dir_entry_2 *de;
1753 bool ret = false;
1754
1755 err = ext4_get_inode_loc(dir, &iloc);
1756 if (err) {
1757 EXT4_ERROR_INODE_ERR(dir, -err,
1758 "error %d getting inode %lu block",
1759 err, dir->i_ino);
1760 return false;
1761 }
1762
1763 down_read(&EXT4_I(dir)->xattr_sem);
1764 if (!ext4_has_inline_data(dir)) {
1765 *has_inline_data = 0;
1766 ret = true;
1767 goto out;
1768 }
1769
1770 de = (struct ext4_dir_entry_2 *)ext4_raw_inode(&iloc)->i_block;
1771 if (!le32_to_cpu(de->inode)) {
1772 ext4_warning(dir->i_sb,
1773 "bad inline directory (dir #%lu) - no `..'",
1774 dir->i_ino);
1775 goto out;
1776 }
1777
1778 inline_len = ext4_get_inline_size(dir);
1779 offset = EXT4_INLINE_DOTDOT_SIZE;
1780 while (offset < inline_len) {
1781 de = ext4_get_inline_entry(dir, &iloc, offset,
1782 &inline_pos, &inline_size);
1783 if (ext4_check_dir_entry(dir, NULL, de,
1784 iloc.bh, inline_pos,
1785 inline_size, offset)) {
1786 ext4_warning(dir->i_sb,
1787 "bad inline directory (dir #%lu) - "
1788 "inode %u, rec_len %u, name_len %d"
1789 "inline size %d",
1790 dir->i_ino, le32_to_cpu(de->inode),
1791 le16_to_cpu(de->rec_len), de->name_len,
1792 inline_size);
1793 goto out;
1794 }
1795 if (le32_to_cpu(de->inode)) {
1796 goto out;
1797 }
1798 offset += ext4_rec_len_from_disk(de->rec_len, inline_size);
1799 }
1800
1801 ret = true;
1802 out:
1803 up_read(&EXT4_I(dir)->xattr_sem);
1804 brelse(iloc.bh);
1805 return ret;
1806 }
1807
ext4_destroy_inline_data(handle_t * handle,struct inode * inode)1808 int ext4_destroy_inline_data(handle_t *handle, struct inode *inode)
1809 {
1810 int ret, no_expand;
1811
1812 ext4_write_lock_xattr(inode, &no_expand);
1813 ret = ext4_destroy_inline_data_nolock(handle, inode);
1814 ext4_write_unlock_xattr(inode, &no_expand);
1815
1816 return ret;
1817 }
1818
ext4_inline_data_iomap(struct inode * inode,struct iomap * iomap)1819 int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap)
1820 {
1821 __u64 addr;
1822 int error = -EAGAIN;
1823 struct ext4_iloc iloc;
1824
1825 down_read(&EXT4_I(inode)->xattr_sem);
1826 if (!ext4_has_inline_data(inode))
1827 goto out;
1828
1829 error = ext4_get_inode_loc(inode, &iloc);
1830 if (error)
1831 goto out;
1832
1833 addr = (__u64)iloc.bh->b_blocknr << inode->i_sb->s_blocksize_bits;
1834 addr += (char *)ext4_raw_inode(&iloc) - iloc.bh->b_data;
1835 addr += offsetof(struct ext4_inode, i_block);
1836
1837 brelse(iloc.bh);
1838
1839 iomap->addr = addr;
1840 iomap->offset = 0;
1841 iomap->length = min_t(loff_t, ext4_get_inline_size(inode),
1842 i_size_read(inode));
1843 iomap->type = IOMAP_INLINE;
1844 iomap->flags = 0;
1845
1846 out:
1847 up_read(&EXT4_I(inode)->xattr_sem);
1848 return error;
1849 }
1850
ext4_inline_data_truncate(struct inode * inode,int * has_inline)1851 int ext4_inline_data_truncate(struct inode *inode, int *has_inline)
1852 {
1853 handle_t *handle;
1854 int inline_size, value_len, needed_blocks, no_expand, err = 0;
1855 size_t i_size;
1856 void *value = NULL;
1857 struct ext4_xattr_ibody_find is = {
1858 .s = { .not_found = -ENODATA, },
1859 };
1860 struct ext4_xattr_info i = {
1861 .name_index = EXT4_XATTR_INDEX_SYSTEM,
1862 .name = EXT4_XATTR_SYSTEM_DATA,
1863 };
1864
1865
1866 needed_blocks = ext4_writepage_trans_blocks(inode);
1867 handle = ext4_journal_start(inode, EXT4_HT_INODE, needed_blocks);
1868 if (IS_ERR(handle))
1869 return PTR_ERR(handle);
1870
1871 ext4_write_lock_xattr(inode, &no_expand);
1872 if (!ext4_has_inline_data(inode)) {
1873 ext4_write_unlock_xattr(inode, &no_expand);
1874 *has_inline = 0;
1875 ext4_journal_stop(handle);
1876 return 0;
1877 }
1878
1879 if ((err = ext4_orphan_add(handle, inode)) != 0)
1880 goto out;
1881
1882 if ((err = ext4_get_inode_loc(inode, &is.iloc)) != 0)
1883 goto out;
1884
1885 down_write(&EXT4_I(inode)->i_data_sem);
1886 i_size = inode->i_size;
1887 inline_size = ext4_get_inline_size(inode);
1888 EXT4_I(inode)->i_disksize = i_size;
1889
1890 if (i_size < inline_size) {
1891 /*
1892 * if there's inline data to truncate and this file was
1893 * converted to extents after that inline data was written,
1894 * the extent status cache must be cleared to avoid leaving
1895 * behind stale delayed allocated extent entries
1896 */
1897 if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA))
1898 ext4_es_remove_extent(inode, 0, EXT_MAX_BLOCKS);
1899
1900 /* Clear the content in the xattr space. */
1901 if (inline_size > EXT4_MIN_INLINE_DATA_SIZE) {
1902 if ((err = ext4_xattr_ibody_find(inode, &i, &is)) != 0)
1903 goto out_error;
1904
1905 BUG_ON(is.s.not_found);
1906
1907 value_len = le32_to_cpu(is.s.here->e_value_size);
1908 value = kmalloc(value_len, GFP_NOFS);
1909 if (!value) {
1910 err = -ENOMEM;
1911 goto out_error;
1912 }
1913
1914 err = ext4_xattr_ibody_get(inode, i.name_index,
1915 i.name, value, value_len);
1916 if (err <= 0)
1917 goto out_error;
1918
1919 i.value = value;
1920 i.value_len = i_size > EXT4_MIN_INLINE_DATA_SIZE ?
1921 i_size - EXT4_MIN_INLINE_DATA_SIZE : 0;
1922 err = ext4_xattr_ibody_set(handle, inode, &i, &is);
1923 if (err)
1924 goto out_error;
1925 }
1926
1927 /* Clear the content within i_blocks. */
1928 if (i_size < EXT4_MIN_INLINE_DATA_SIZE) {
1929 void *p = (void *) ext4_raw_inode(&is.iloc)->i_block;
1930 memset(p + i_size, 0,
1931 EXT4_MIN_INLINE_DATA_SIZE - i_size);
1932 }
1933
1934 EXT4_I(inode)->i_inline_size = i_size <
1935 EXT4_MIN_INLINE_DATA_SIZE ?
1936 EXT4_MIN_INLINE_DATA_SIZE : i_size;
1937 }
1938
1939 out_error:
1940 up_write(&EXT4_I(inode)->i_data_sem);
1941 out:
1942 brelse(is.iloc.bh);
1943 ext4_write_unlock_xattr(inode, &no_expand);
1944 kfree(value);
1945 if (inode->i_nlink)
1946 ext4_orphan_del(handle, inode);
1947
1948 if (err == 0) {
1949 inode_set_mtime_to_ts(inode, inode_set_ctime_current(inode));
1950 err = ext4_mark_inode_dirty(handle, inode);
1951 if (IS_SYNC(inode))
1952 ext4_handle_sync(handle);
1953 }
1954 ext4_journal_stop(handle);
1955 return err;
1956 }
1957
ext4_convert_inline_data(struct inode * inode)1958 int ext4_convert_inline_data(struct inode *inode)
1959 {
1960 int error, needed_blocks, no_expand;
1961 handle_t *handle;
1962 struct ext4_iloc iloc;
1963
1964 if (!ext4_has_inline_data(inode)) {
1965 ext4_clear_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);
1966 return 0;
1967 } else if (!ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA)) {
1968 /*
1969 * Inode has inline data but EXT4_STATE_MAY_INLINE_DATA is
1970 * cleared. This means we are in the middle of moving of
1971 * inline data to delay allocated block. Just force writeout
1972 * here to finish conversion.
1973 */
1974 error = filemap_flush(inode->i_mapping);
1975 if (error)
1976 return error;
1977 if (!ext4_has_inline_data(inode))
1978 return 0;
1979 }
1980
1981 needed_blocks = ext4_writepage_trans_blocks(inode);
1982
1983 iloc.bh = NULL;
1984 error = ext4_get_inode_loc(inode, &iloc);
1985 if (error)
1986 return error;
1987
1988 handle = ext4_journal_start(inode, EXT4_HT_WRITE_PAGE, needed_blocks);
1989 if (IS_ERR(handle)) {
1990 error = PTR_ERR(handle);
1991 goto out_free;
1992 }
1993
1994 ext4_write_lock_xattr(inode, &no_expand);
1995 if (ext4_has_inline_data(inode))
1996 error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
1997 ext4_write_unlock_xattr(inode, &no_expand);
1998 ext4_journal_stop(handle);
1999 out_free:
2000 brelse(iloc.bh);
2001 return error;
2002 }
2003